Yarn-splicing device for knitting-machines.



APPLICATION FILED JAN. 21, 1910.

Patented Aug. 9, 1910.

6 BHEETS-SHIIET 1.

INVENTOR (a, BY 4 WITNESSES $13MW APPLICATION FILED JAN. 21. 1910.

Patented Aug. 9, 1910.

6 SHEETS-SIIEBT 2.

v {NVENTORI WITNESSES:

A TTORNE Y7;

H. A. HOUSBMAN. YARN SPLIGING DEVICE FOR KNITTING MACHINES. APPLIOATIONFILED JAN.21,1910.

Patented Aug. 9, 1910.

GEHBETS-SHIBETG. Q Ma;

WITNESSES: I

J, INVENTOR R BY M W M mam",

u dg RNEyfi A. HOUSEMAN. YARN SPLIGING DEVIGBFOR KNITTING MACHINES.

APPLICATION FILED JAN. 21, 1910.

Patented Aug". '9, 1910.

6 MEETS-411E111 4.

WITNESSES H. A. HOUSEMAN. YARN SPLIGING DEVICE FOR KNITTING MAGHINE$.

APPLICATION FILED JAN. 21, 1910.

Patented Au 9,1910.

6 w TEE-SHEET 5.

' amolermm H. A. HOUSEMAN. YARN SPLIOING DEVICE FOR KNITTING MACHINES.

APPLIUATION FILED JAN. 21, 1910.

' Patefited Au 9,1910.

e MEETS-sum 6.

III II "II .II II III! l l ll II If?! INVEN TOR the roller 1' rests.

the walls of which at the ends have the projections h. v

30 is a rock-shaft and j a sliding plate.

0 is a clamp formed of the two members I: and Z connected by spring m..The member Z is mounted on a plate 7'0 on shaft 0. The part L ispivotally conected at is to the plate n. Projecting from the tail pieceq of clamp member 7a is the roller 1. The plate 91, rests on a sleeve 5.The uppersurface of the sleeve 8 has the cam surface t upon which Whenthe sleeve 8 is ele- Vatd both clamping members is and Z are elevated.hen the shaft 0 is rotated the clamp as a whole is rotated, and,in onedirection, the cam 15, acting on roller 1, opens the movable jaw againstthe action of spring m and, in the other direction, the cam allows thesprin m to close the jaws.

From tie rock shaft projects the finger u resting between the flanges oand Q1 of sleeve 8 and when the shaft is rocked in one direction thesleeve is elevated and with it the clamp, and, when the shaft isreturned, the sleeve and clamp-are returned to their initial position.

The sliding plate j has the forked projection in between which a pin :0,projecting from a lever y mounted on shaft 0 rests. "When this slidingplate j is moved in one direction the lever y is moved, rotating theshaft and with it the clamp, the cam surface of the sleeve allowing thespring to close the clamp, and in the other direction reverses therotation of the shaft and the clamp, the cam surface causing the clanipto open against the action of the spring.

40 is the shaft for shifting the clutch to change the movement of thecam cylinder 41 from rotation to reciprocation and vice versa, asdescribed and illustrated in Letters Patent issued to me April 30, 1895,No. 538,518. Upon this shaft are the cams a and 25. a is the cam foroperating gear 6, and b is the cam for operating the sliding plate j.

The connections for operating gear 6 are as follows: The follower 1 forcam-a has a rod 10 which is connected to the frame of a segmental gear 2pivoted at 36. This segmental gear forms a lever of the third class. Thesegmental gear meshes with a gear 37 on shaft 3, on which shaft is thegear f. The tail piece 4 of the segmental gear 2 carries a cam 5, whichin the upper portion of the throw of the segmental gear strikes a pin'38 on the arm 100 fast on rock shaft 30. This lever 100 is providedwith a spring 7, one end connected to lever. 100 andv the other pin 38in line with cam 5.

A. sprii'ig 8, one end connected with the frame of machine and the otherend conrod 10 down against action of cam (r and returns it, andsegmental gear when the cam 11. allows rod 10 to drop after beingelevated. The threads pass through the tension device 12 acted on byspring 13. A pivot/ed. finger 14:. is adapted to rest under this tensionde' vice and relieve the action of its spring. This finger is,controlledby the pivoted trip 15, the tail piece of which is operatedby a. pin 17 on the frame of segmental gear, which pin 17 is in suchposition that when theseglnental gear is in its upper position the tripholds the finger 14' to maintain the tension device out of operation,(see Fig. 16) and when the segmental gear is in its lower i osition, asecond pin 1'? releases the trip, a lowing the tension device to go intoaction.(see Fig. 17).

The connections from cam b for operating the sliding plate 7' are asfollows: The rod 18 from earn 1) has a spring normally holding it in itsdownward position and returning it to that position when cam allows therod 18 to fall from'its elevated position. The rod 18 is connected by abell crank lever 19 and connecting rod 208 to sliding plate 7' so thatin the movement of the rod 18 in one direction the plate 7' is movedforward and in its movement in the other direction returnsthe slide. Onthe end of the slide j is the incline 20.

21 and 22 are the cutter jaws. The 'aw 21 is pivoted at 23 and jaw-22 ispivoted at 24 on stand 250 in front of the winder 300. On the face ofthe cutter jaw is the groove 260 in which rests the pin 270 connected tocutter jaw 21. An arm 280 is pivoted to jaw 21. This arm, at its, lowerend, is beveled and rests on slide A spring 290, having one endconnected to tail piece ofjaw 21 and the other end to stand 250,normally holds the two jaws together.

-VVhcn. the slide moves so that the arm 2S0 cular work (camcylinder-rotating) the pawl is prevented from operating tooth 52 as thecrown of the tooth is longer than the throw of the pawl. The ratchet isshifted j to make this tooth operative in the manner end to the frame ofthe machine. The pu'rdescribed in my said patent. The pawl then operatesteeth 52 and 53 and the shift to reciprocation is made, and after suchshift, operates on tooth 54. It is prevented from operating on the nexttooth 55 by shield a which when released causes pawl to operate nestedto boss 9 on red 10, normally holds 1 teeth and 56. The rcshift of theclutch purpose I use the following device.

acacia i i shifting shaft to return the movement of the cam cylinder torotation takes place with tooth 56.

The cams o and b are formed as shown so that with the operation of tooth52%,through the mechanism described, the clamp holding the supplementalthread in line with open forward end of theslots rotates, carrying thethread into and along the groove in the tube at the same time theseguiental gear allowed to drop sligl'itly, to carry the supplementalthread rearward in the slot. (hi the action of tootl'i 53 thesegn'icntal gear allowed to drop :t'reely and the supplemelil tal threadis firmly wound on, the main thread by the rotation of the tube, and isdrawn into the necdh-s by the main thread without any tensionresistance, and finally the clamp mores downward. at substantially theend of the drop of the segmental gear the tension trip is released andthe tension device i goes into action, the supplemental thread at thattime being tally entered into the needles. The action of tooth 54-rotates the clamp forward, opens the cutters, and separates or opens theclamp iIlII1b'Bl'.S., The action of tooth 55 partially raises thesegmental gear, raising one member 1 0-IlECllIl1P- ing members/ c and lof clamp 0 between the supplemental and inain threads and rotates clampoutward, drawing the supplemental thread into line with the open end ofthe spiral slot and toward the cutters. The action of tooth 56 bringssegmental gear to its upper position, bringing trip into action to holdtension device out ot' action, and further rotating the clamp to bringthe thread in cutting relation with cutters, closing the cutters on thesupplemental thread and clamping the tree end of that thread be-.

tween the clampingmembers l: and Z or clamp (a his completes a cycle ofopera tions of cams on and 5, through the mechanism described, upon theclamp, cutters and seinnental gear and its connected Winder and thetension device, in one rotation of the shifting shaft produced by theaction of the pawl 51 upon the teeth :33, 54;. 55 and 56 ot' the ratchet50. The use eta segmen tal gear in the form of a lever'of the third-class, enables it to drop quickly and avoids any complicated mechanismand makes the rotation of the tube to wind rapidly.

then the sum ilcineutal thread has been removed out of action, cu i andheld by the clamp, the suppleiinental thread, coming from the cop shouldbe locked Forthis The Sll{)1')l(li'l(lli,ll thread passes between thejaws 200 and E201, pivoted together, the tail piece 202 't'rmn one ofthe jaws, is provided with a spring eonuectioi'i 203 which normallyholds the jaws closed. The jaws are opened at the proj'ier time by thefollowing mechanism: The tail piece has a cut away portion, as shown,which when the jaws are closed, rests in the. low point of a ivoted camlever 20 i, acted upon by the spring 201, which spring tends to pull thecam lever in a direction to elevate the tail piece and re lease thejaws. The tail piece 206 not this cam lever rests against a springacted'trip 20?, which holds the cam lever a ainst the action of its spring.The stan 209 on which this spring acted trip 20? is mediated, isconnected to the connecting rod 208, which connecting rod, throughmechanism hercinbetore described, operates the sliding The position oithis connecting rod during the period in which the supple mental threadnot being used for ltnitting, is in a rearward position, and in suchposition that the trip holds the cam lever out of action, as shown inFig; This, the only position in which the supplemental thread isentirely inactive. in all other positions or conditions it is eitherbeing twisted or drawn into the needles, or sepa rated from the mainthread and withdrawn. from the needles and cut The initial move merit ofthe sliding plate as hetero described, is a rearward one to move theclamps longitndinz-illy rearWu-rdly or"? the groove in the winder, inthis rearward movement the trip beyond the tail piece of the cam lever)and the cam lever acts through its spring to open the arts, @n'theforward movement of the sliding rod, the trip 20"? being pivoted at 210,and acted on by the spring 5211, will turn on its pivot point withoutaflec ing the cam lever. On its return rearward movement, the plate willstop at a point which will hold the trip at a point shown in Fig. 12,when it will have pushed the cam lever into such posi-' tion as to causethe tail piece acted on by its spring to close the aws, 200 and 201,

i and will maintain it locked in that position until the precedingdescribed operation is again resumed.

Having now fully described. my inven tion, what I claim and desire toprotect by Letters Patent is: 1. in a knitting machine. the combinationof a rotary winder, comprising a tube having an open ended spiralgroove, through which tube a plurality of threads a clamp for holdingone of said threa s in line with the mouth of said groove, means tosimultaneously rotate said winderand move said clamp longitudinally otthe Winder to carry said thread along said groove. i 2. lo a knittingmachine, a thread separator said spreader, eoinprisii'ig a clamp havingclan'ipii'ig members, one clamping member of which forms a s tireader toseparate the running and introduced threads and draw the introdtmedthread away from the running thread, and means to cause said 130clamping, member to close on said thread when drawn away from therunning thread. 3. In a knitting machine, the combination .with a threadseparator and spreader, comprising a clamp having clamping members, oneclamping, member of which forms a spreader to separate the running andintroduced threads and draw' the introduced thread away from the runningthread, of means to cause said chimping member to close on saidintroduced thread when drawn away from the running thread, cuttingmechanismin line with said introduced thiread when drawn away from therunning thread, and means to operate said cutting mechanism. i

4. .ln a knitting machine, in COlTtlJlfltlilOn, a rota ry winder havingan open ended spiral groove, hreads passing through said winder, a clampbetween the members of which one of said threads is adaptedto be held inline with the mouth of said groove, means to successively give the clampthe following movements, a movement longitudinally of the winder,downward and longitudinally in a reverse direction, opening the members,then laterally and vertically to' bring one member between the threads,then laterally in a reverse direction to separate the threads to drawone thread away from the other, and finally closing the clamp on thethread.

In a knitting machine, in combination, a rotary winder having an openended spiral groove, threads passing through said winder, a clampbetween the memlwrs of which one of said threads is adapted to be held.in line with the. mouth of said groove, means to successively give theclamp the following movements, a movement. longitudi' nally of thewinder, downward and longitudinally in reverse direction, openine themembers, then laterally and vertically to bring one member between thethreads, then laterally in a reverse direction todraw one thread awayfrom the other, cutting mechanism into which the thread is drawn in thelast movement, means to close the clamping members on the thread, andmeans to operate the cutting mechanism in the last men tioned movement.

6. In a knitting machine, a rotary tubular winder through which aplurality of threads pass, said winder having an open ended spiralgroove, means to enter the introduced 'threadinto the mouth of thegroove, and

means to rotate said winder.

7. In a knitting machine, a winder through which a plurality of threadspass, said winder having an open ended spiral groove, means to rotatethe winder, means to carry the introduced thread to the month of thespiral groove, and means to positively move the introduced thread in the,groove longitudinally of the winder.

8. In a knitting machine, in combination,

a rotatable winder, a clamp adjacent: to the winder, said clamp havingmembers, a rotatable shaft upon which said clamp is mounted,

a plate having a cam surface, there being a projection from one clampmember resting on said cam surface, and'means to rotate said shaft.

9. In a knitting machine, in combination, a rotatable winder, a clampadjacent to the winder, said clamp having members, a rotatable shaftupon which said clamp is mounted, a plate having a cam surface, therebcing; a projection from one clamp member resting on said cam surface,means to rotate said shaft, and a spring connection between saidclamping members.

10. In a knitting machine, in combination, a rotatable winder throughwhich the threads pass, a claim p having clamping members, the saidclamp being adjacent to the winder, a movable sleeve said threads beingguided in alinement with said movable sleeve, said movable sleeve beingadapted to move said clamp to cause one clamping mernher to enterbetween the threads, and means to move said sleeve.

11. In a knitting machine, in combination, a rotatable winder throughwhich the threads pass, a clamp having clamping incinhers, the saidclamp being adjacent to the winder, a rotatable shaft upon which saidclamp is mounted, a plate having a cam surface, there being a projectionfrom one clamp member resting on said cam surface, a movable sleeve saidthreads being-guided in alinement with said movable sleeve, said movablesleeve being adapted to move said clamp to cause one member to enterbetween said threads, means to rotate said shaft, and means to move saidsleeve.

12. In a. knitting machine, in combination, a rotatable winder throughwhich the threads pass, a clamp adjacent to the winder, said clamphaving clamping members, a

rotatable shaft upon which said clamp is mounted, a plate having a camsurface, there being a prenection from one clamp member resting on saidcam surface, a sliding late,

and connection betwecn'said plate and said shaft whereby, in themoizen'ient of the plate in one direction, the shaft is rotated in onedirection, and vice versa ,in the opposite direction of movement of theplate, and means to move said plate in opposite directions.

13. In a knitting machine, in combina tion, a rotatable winder throughwhich the threads pass, a clamp adjacent to the winder, said clamphaving clamping members, a rotatable shaft upon which said clamp ismountecLa plate having a cam surface, there being a projection from oneclamp member resting on said cam surface, a sliding date, and connectionbetween said plate, and said shaft. whereby, in the movement of the,plate or note in one direction, the shaft is rotated in doe directionand vice verea in the opposite (ii-- reotion of inoven'ient of theplate, a clutch shifting shaft, :1 coin upon said shaft, and

connection between. said cam said plate.

14 The combination, doinprisingr a 'WlHlTlGI' for the end: of thei11-.;rodnced thread, a inovalole clamp, saidjclainn lacing adacent tothe Winder and. havingclamping members one clamping member of wt 'c 'terbetween the introduced thread and the running thread, and means tooperate said clamp so as to separate the said threads and hold thasupplemental. thread in preparation for a further operation.

15. The combination, comprising a Winder for the endtof the introducedthread, a mov ahle clamp, one member of which is adapted to enterbetween the introduced thread and therunning thread, means to operatesaid clamp so as to separate the said threads. and hold the supplementalthread. in prepari tion for a further operation and means to move theclamp longi itndinally of the Winder duringthe initial iotatation of theWinder.

1 6. lln a lrnittingr machine, in comhination, a rotatable winder, clampadjacent thereto and having clain iiing men'ihcie, a retatable shaftupon which said clamp is mounted, a plate having a corn surface, therebeing a projection from one clamping inem her resting on said camsurface, a vertically movable sleeve adapted. to elevate said clamp,means to more said. plate, a tool: shaft for operating said. verticallvn'iovahle sleeve, a clutch shifting shaft, came upon said shaft,connection between one cam and the plate, connection lietiveen the othercam and the rock shaft.

W. in a knitting machine, in cornhi iation, a rotatable Winder, a clnnpadjacent thereto and" having clamping}; members, rdtatahle shaft uponwhich said clamp is inoilnted, a plate having a earn snrface,.therehcing projection from one clamping'memhcr reatint on. said cam surface,means to rotate said shaft, cutting mechanism, and means to open saidcutting mechanism in the on oration of the means to rotate the shaft inone direction and close said cutting; mechanism in the operation of themeans to re tate the aha. in theotl'ler direction.

18. lln a knitting machine, in coinhination, a rotatable winder, a clampadjacent tl'ioretc and having clamping ineml'iers, a rotatable shaftupon which said clamp is mounted, a plate haviong a earn surface,-thercbeing a rojection from. one clamping member rest mg on said cam surface,means to rotate said shaft, cutting mechanism, and means to render saidcutting" mechanism receptive and means to operate said cutting means.

19. in a knitting machine, in combination, a rotatable winder, a clampadjacent thereto and having clamping; members, a in,

h is adapted to on;

tatahle shaft upon Which said clamp mounted, a plate having a camsurface, there being a projection. from one clamping mom her resting;on. said oanisurface, a sliding plate, connection hetvveen said plateand said. shaft Whereh v, in the movement of the plate in one directionthe shaft rotated. in one direction and. vice versa in the opposite direction of moveinrnt of the plate, means to move said plate in.oppositedirectione, cutting; mechanism, and connection between saidcutting niechanlsm and said plate,

adapted in the movement of the plate in one direction to render saidcutting mcchanisni receptive, and in. the other direction to operatesaid cutting mechanism.

20. in a knitting machine, in combination, a rotatable Winder, a clampad acent thereto and having clamping members, a rotatable ell-raft uponwhich said clamp is mounted, a plate having. cam surface, there being; aprojection from one clamping member rest ing on said earn surface, asliding plate, connection between plate and said shaft- Wherehy, in themovement of the plate in one direction the shaft is rotated in onedirection and vice versa iiithe opposite direction of movement of theplate, cuttinginechanisni, conneeti on loot-Ween said cutting mechanismand said plate, adapted inthc' movement of the plate in one direction torender said cutting? mechanism receptive, and inthi other direction tooierate said cutting;mechanism, a clutch shifting shaft, a cam upon saidshaft, and connection hetvveen StLlCl earn. and said plate for operatingsaid plate. E1. in a knitting machine, in coinhii'lation, a rotataloleWinder, a clamp adjacent thereto and having clamping members, arotatable shaft upon which said clamp is mounted, a plate having a camsurface, there being a projection from one clampingnicmher resting onsaid cam surface, a sliding plate, and connection loot-Ween said plateand said shaft Wlierehy, in the moveincnt of the plate in one direction,the shaft is rotated in one di rection and vice versa in. the oppositedirection of: movement of the plate, a rotatable shaft, a cam upon saidshaft, and connection between said earn and said plate.

22. in admitting machine, in combination, arIJotatahle hinder throughwhich a plural ity of threads pass, a clamp adacent thereto and havingclaniping n'lemhers, a movable sleeve adapted to move said clamp, meansto move said sleeve, a rock. shaft for operating said movable sleeve, arotatable shaft, a cam upon. said shaft, and connection hetwcon saidcan-1 and said shaft for rocking said shaft, the threads passing throughthe winder heing guided in alinoment with said sleeve,

23. lo. a ltnitting machine, in combination, a rotatable winder through'whicli' a plurallee.

ity of threzfds pass, a clamp adjacent thereto and having clampingmembers, a rotatable shaft upon which said clamp is mounted, a platehaving a cam surface, there being 55 a projection from one clampingmember resting on said cam surface, a movable sleeve adapted to movesaid clamp, means to move said plate, a rock shaft for operating saidmovable sleeve, a rotatable shaft, cams upon said shaft, connectionbetween one camand the plate, connection between the other cam and therock shaft, said threads passing through the winder being guided inalinement with said sleeve.

24. In a knitting machine, a rotatable winder through ity of threadspass, said clamp having clamping members, a rotatable shaft upon whichsaid clamp1 is mounted, a plate having a cam surface,t ere being aroje'ction from one clamping member resting on said cam surface, aslidin plate, connection between said plate and S\l( shaft- Whereby, inthe movement of the plate in one direction the shaft is rotated in onedirectiornand vice versa in the opposite direction of movement of theplate, cutting mechanism, connection between said cutting mechanism andsaid plate, adapted in the 39 movement of the plate in one render saidcutting mechanism receptive, and in the other direction to operate saidcutting mechanism, a rotatableoshaft, a cam upon said shaft, andconnection between said cam and said plate for operating said plate.

25, In a knitting machine, in combination, a rotatable winder, throughwhich the supplemental and main thread pass, a gear for operating 40said gear, a tension device for the threads, a trip for holdingsaid-tension device out of action, and means adapted at the completionotthe movement of the gear in one to release said trip, and means 15 incombination,

which a plurala clamp adjacent thereto,

direction adapted at the completion of the movement of the gear in theopposite direction to throw said trip' into action.

. v 26. In aknitting machine, in combination,

' arotatable winder, through which the sup- 0 plemcntal and main threadspass, a gear for operating said winder, means to oscillate said gear, a.tension device for the threads.

a trip for holding said tension device out of action, a device carriedby said gear which acts against said trip to throw it out oi action atthe completion of its movement in one direction and to throw said-tripinto action at the completion of its movement in the opposite direction.

27. The combination with the pivoted jaws and the spring for closingsaid jaws, of the cam lever and its spring for normally holding saidclamp open, a trip cooperating with said cam levenin the movement in onedirection of the trip, and adapted to release direction to.

said winder, means to oscillate l I l,

movement of the trip to hold the cam lion oi the trip, Ineans to movesaid trip in its cooperative dlrection to and beyond the cam levermeans,

"beanie said cam lever and hold it against the action of its spring,means to move said trip in its coiiperative direction, and means to stopthe iovc'ment of the trip to hold the cam lever in its inactive positionagainst the action of its spring means to guide a thread between thejaws of said clamp.

28. The combination with the pivoted jaws and the sprin for closin saidjaw o the cam lever an its spring or normally holding said clamp open, atrip cooperating; with said cam lever, in the movement in one directionof thetri and adapted to release said cam lever an hold it against theaction of its spring, means to move said trip in its cooperativedirection, means to stop the movement of the trip to hold the cam leverin its inactive position against the action of its spring, and means tocause said trip to continue its movement in the same direction to passbeyond and release said cam lever means to guide a thread between. thejaws of said clamp.

29. The combination with the pivoted jaws and the spring for closingsaid jaws, of the cam lever and its spring for normallj hold ing saidclamp open, a trip cotiperating with said cam lever, in the movement inone direction of the trip, to release said hold it. against the actionor its-spring, and inactive in the movement -of thetrip in the oppositedirection, means in move said trip in its coiiperative directiommeans tosto the lever inits inactive posit ion against the action of its spring,means to cause said trip to continue its movement in the same directionto pass beyond and release said cam lever, and means to move said tripin its non-cooperating direction to its initial position means to guidea thread between the jaws of said clamp. v

30. The combimltion with the pivoted jaws and the spring for closingsaid jaws, of the cam lever and its spring for normally holding saidclamp open. a trip cotipcrating with said cam lever. in the movement inone directo release said cam lever,

to guide a thread between the jaws of said clamp.

31. The combination with the pivoted jaws and i hc spring for closingsaid jaws, of the cam lever and its spring for normally holdinn saidclamp open, a trip cooperating with said cam lever, in the movement inone direction of the trip. to release said (am lever and inactive in themo ement in the opposite direction, meansto move said trip in itscooperative direction to and beyond the cam lever, and means to movesaid trip in its nonooiiperating direciidn to its initial position meansto guide thread between the jaws of said clamp.

earn lever and lever and hold it against the action of itsv 32. Thecombination withthe pivoted jaws and the spring for closing said jaws,ot the cam lever and its spring for normally hold-.

ing said clamp open, a trip pivoted to be active, in the movement in onedirection of the trip, and adapted to release said cam 'plpringmeansjtomove said trip in its active irection, and means to stop the movement ofthe trip to hold the cam lever in its inactive position against theaction of its spring means to guide a-thread between the jaws ofsaidclamp.

33. The combination with the pivoted jaws and the spring for closingsaid jaws, of the cam lever and its spring for normally hold-t ing saidclamp open, a trip pivoted to be ac tive, in the movement in onedirectionof the trip, and adapted to release said cam lever and hold itagainst the action of its spring, means to move said trip in its activedirection, means to stop the movement of the trip to hold the cam leverin its inactive posiand release said'cam lever means to guide a 7 tionagainst the action of its spring, and means to cause said trip tocontinue its movement in the same direction to passbeyond thread betweenthe jaws of said clam 3d. The combination with the pivote jaws and thespring for closing said jaws,of the cam lever and its spring fornormally holda ing said clamp open, a trip pivoted to be active, in themovement in one direction of the between the jaws of said clamp.

trip, 130 against the-action of its spring release said cam lever andhold it and inactive in the movement of the trip in the oppositedirection, means to move said trip in its active direction, means tostop the movement of the trip to hold the cam lever in its inactiveposition against. the action of its spring,

- means to cause said trip to continue its movement in the samedirection to pass beyond and release said cam lever, and means to movesaid trip in its non-active direction to itsinitial position means toguide a thread 35. The combination with the pivoted jaws and the springfor closing said jaws, of the cam lever and its spring for normallyh0lding said clamp open, a trip pivoted to be active, in the movement inone direction of the trip, to release said cam lever, and inactive inthe movement in the opposite direction, means to move said trip in itsactive direction to and beyond the-cam lever, and means to move saidtrip in its non-active direction -,to its initial position means toguide a thread between the jaws of said

